[avandonk]

I would be working out a way to control the anti dew heating of your optics. A very good thermostat or PID that only allowed heating to a few degrees above ambient would be a start. The differential cooling/heating of the metal and glass in the last part of the optic train with ambient temperature fluctuations would make adjusting spacing a nightmare. You are forever chasing a changing configuration. Fast optics come with a price! I would go for a thermostatically controlled temperature using a PID (proportional integral differential) controller. Air currents due to convection in the last part of the optical train are not as critical to aberration. Multi element correctors and spacers will come to equilibrium with constant temperature.

Just a few thoughts Mike. I am not as mad as you think. It would be a set and forget as the conditions are under your control. Not driven by the vagaries of ambient temperatures and all the hystereses that hides the real cause. Have a yarn to the manufacturers as they just do not realize what huge temperature fluctuations we experience here in Australia.

I will not comment on your image as it is not too bad for a beginner with a new optic.

Bert